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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6312aa6ef96393d1948866b1bd75f532f34d1b5a785fa56226439d26e58b04' 
  AND token = '7KhSI3l/zjNJcoMHhY2+z5m3i555n0N2lFmU3S7xDX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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