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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ec716f61d0f1e4a387357eb201b55121c0dec3e8714df45411a7178a3e1a45' 
  AND token = 'RT4dCZFolS/4hRgVnGyUtDl5qhnCtQORETRjqD1j1k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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