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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4872a061636d8a51d96ff4dd43f64e05a67270cf2ac956c2d4b8a803aa5a9fdb' 
  AND token = 'y17OufbhpjAPQ5AvLh2XS7uliX/XEL0Tur+bGlw7ndE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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