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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80fcc3e99a7601151602545d29ef3e4670da1fc90003760dd1cb2218122edbfd' 
  AND token = '8IBgzW9oB22daGB73o6oqw/oJZs+3ooq+iX1sHRWU3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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