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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405e2ea6980916cd70b93d93b9e4f536a4442dccb73a4829fa12c09038c95f4e' 
  AND token = '7lZaQs/KmtLJn1CZwXdJcNBw0XZkBIimE14QT28whUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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