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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc717041c0e88fe7e32b7b3cfbc604b893407679d76d169d2b0640dc92323e8' 
  AND token = 'PTNPNQ5pFEKHcbJK2ELp6rtuppQICWJ9u+VkiQqzCP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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