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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2142a388e95aae8c1034a23474ed168749c43c077b71c654f391ace47132a9d5' 
  AND token = 'ArJWE2j76GXjbY5iqw5JIQocP8MTyuXQrB3Xq5mkcVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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