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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aafc805ced145807fe84103ba80d86bf5dbdd147883d005dbef49ac264651dd' 
  AND token = '5Ig+Ec2v/eLJK0Ivp8UYY7fe14juc01MILPztKyLoQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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