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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27930a88319e3f49f74b0f7eb55c3bec7bfed1767423aea399df2d89d9a304d' 
  AND token = 'tFK2s/a6g4MLSyLwrnELAEJQpNocVkW0dCDxv+qZeFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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