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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19880a34cdaa0c5c8059367817abf4bee5c3f7ca021cc78f4eec8c5ae7e2c9ca' 
  AND token = 'qM0JNRJ23SB3+FaDlKkpFDPqFtH9Es+P/n1G8oqG4pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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