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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86e29b63cf7268e344456f1bd699f838c138f9d1a3cff111df5eacd06d60281' 
  AND token = 'rCtGYt+bDGO2Yq6XlwNnYBWcfKQmODjBdWYX20GlsOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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