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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3fa29c566ce134df5be138b057795ddfbf31a53223f5a270f9a71b268b9a79c' 
  AND token = 'JBclwa0Y6JdFeZ0exirKcI5cVQ866bsoGGIsp1EThsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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