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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f1aa914c649bb17105efe77992fd3ee9ad194dbe1033ee4d939458b38c56bb' 
  AND token = '6sbvsWJIR4xNl4RI8kX37tFcIEh+vrwxp0k5C+KVWo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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