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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407089ad91fa1e0e2150ca7c17523c7db525a825a999eeb3f5746b933d3dde4d' 
  AND token = 'c7H1lWgZeYBNEkkXLCNVTegWrpNJbLL96mxSc9xHdT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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