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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28226604c55ca73b28fcc415936c88e3d2fa8dfe9ec2b60ce69cbce9e0cf3fd3' 
  AND token = 'ik+pe6gkIaVMm46wT3XmZZVwC1IdrO04poLV5OCbBXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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