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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b10eb71a36730da0f87f367f407b52a9fa0b7ddcca0279f7ac84616ea8e1aa' 
  AND token = '7oQur0JybkufluB70kKQE9Cr1TErCeg4jS1z/me7Fec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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