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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440da206cac2edbc99b645db71bd3a97b644479477a5a45fc4ec96842a883d0c' 
  AND token = 'MlyW7OetsnJAF3NtDbAz2oArR1iP0PQLGGxhRJJuJfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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