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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e1ddc01aeab9bbffe8520530ad19cce93147ef75aa3679a1a9de81e12a4599' 
  AND token = '32S42VOTtIUQFF4wWlCO5IHjPG8W/Hyup8ERKxhi6nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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