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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95350058bb99f9ed4e3c6c7dc93cb6f939085db1f52d2d9e1c36a7d024cf571e' 
  AND token = 'F7416OM08ymgtcF2UR21Uz7deZqz8X2BltHBV0SU4Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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