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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de21484009b8dbcd224688a77294f0c0dd0bb7010b22898101e741df7958694b' 
  AND token = 'urDPXtLcwAa7KnH/PhSfxFkOg4PFOpT83M6BEoV64EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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