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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7ad0c0cf6ad6ea1ae771c3dcee6a0f8dd6642d6e268a82e7508732b5c470ab' 
  AND token = 'rn1KyYPwE5/rO0gSyHNuuj3UQj/OXjMX4K1VrmzpmRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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