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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2a76e20311901eebae3234f2ff9bd55a1df8689b74199a83901f04ff382a9f' 
  AND token = 'nVdtUSzXJJfJEp3PIy4lYdd0sLkqj763EaCxfg1t47s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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