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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ac0b7ccdf15eb2e13c8eda8f36f938965a55be81cfcbd831debe51a6f47a86' 
  AND token = 'toBLquBgSdGrNt7mRJ2yYbMwOAecFmWMdh/dodcCaZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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