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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a2df3a55dd9c8895c467bb2f2f198fc28dee4c21d04d6214e67378ca7a8f0a' 
  AND token = '8W8dgIR1i0PJlKhlmfhDLnQUWi6edmtpXWQmM2hsDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}