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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6ee0bdd9f2f497ae4f1d505cf97a35bf2c64464c342b1642d0e89f6f2114b2' 
  AND token = 'cS6O6mGnBA3vg/DQVJ91OnV+kw51dtI8D8CUokkfyBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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