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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb25e9a1f8805e6068ac33368cc123c44f752c5d03d5fb648e6e1855225eff7' 
  AND token = 'HDgNEqTUbBqU2OmK+NZ7xjfKtXymTMg6LKH4PQw4H9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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