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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e340cb1731635edded7330f6dc6eea17716e47930470e0e5a2c1292b54b9253c' 
  AND token = 'IjS3UHyPRgtbZW5eDhwcuvKECqahuvrD1thuZwu5bPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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