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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdbd7790ed088c45cf369a64d49a2b7c48eafeeffe31b79ca169e5ee0f28295' 
  AND token = 'ccZsJCmFQC1btM6d9ggk1/OE0Csa/0q0VpVq9XqnD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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