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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e50d3c75d3a5f646f13eaf6415ff47e674e09a2222973f0c745ed3be80bd8c' 
  AND token = 'i7Ufz3jxltZZHGLcHiu44EXfkEcCx3Reir9ffs6OtPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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