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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0321a2fb26089863b2f575b533a73bb2534c01031a621abf401e850e2cb4afe3' 
  AND token = 'g2UxKEAbxqO3HPYrH5zMPgzzagqApFEJ80J0IyRU/No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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