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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84878c2e6de047ffad5b07a18028320097ea8e89a9ea5f599cad9c76cdd498da' 
  AND token = 'mSoATyEEJlBe/RXRg6zqSDgRJ9kTIunqZ1t7EqeAiYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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