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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7237964910540bd3fe29ea19c43d2dfb0cf40e243b1a171a7916cda737cc0e8e' 
  AND token = 'ijp1dRpOBRpqH1wswF8VIlFO/Yf8MB0wsBHJKACb2nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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