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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83afdb1495aa35ac8de408dc805205f5c2654da4c5f19fc6aba314a7cdf5895' 
  AND token = 'P9c5h1jG/BmOjYl0cVST9jBa4in8AYGyc3aYIg1DtsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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