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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16ea270bc3f54e336fba28a28488bbfe1c42c8dfb8045894870e3b8c2ce3e62' 
  AND token = 'FIkqk2olCuCP0DHM1LoUVSbKBoQshtdp3p8h+OGfe10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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