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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8da838d53c79f4b160f3c265e38d38b3ad2e5ac8a40c282763555c4797c5f51' 
  AND token = '5q4IhykZHo4XDG+Sg+TpkU4nXEciN2TaIstHfvzc0eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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