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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b719f8df93a11927ffa8b21644cd572205314ba5280d29efe5f481d3e2cc3afc' 
  AND token = '7Q7HVk8OaiOKsJnhhoIob+JafRNchPJ8AIRJVohJ3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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