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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa29a92586b4745fee3b04aa289c2c6c1b4ebacd3a4e3e53277f1cc9c6bc2a14' 
  AND token = 'PQWIKYiXRc7Ry50AVhyvdseR1fJtsN799tVkttdnnaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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