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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63320f9f5872a8a2ae7d0011810f11ebcad2c25de9f2f4af84d16abe8909d5a2' 
  AND token = 'T9P3CgI6mx3fZ9vcpiHMaicZQgNkBZXOMXJTLpJ+BIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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