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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69405fb02f13865deb0aeecc3d44640e2c84983588955a8f849c144caf40b634' 
  AND token = '8kotbPioIgLbH8knF3UPsP2cUXp+kZ+BrhoQ7KYhCnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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