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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1a812a271e4c3b3d81effbcb531f20b880a0d60946c5a77cf42bab4a869b0b' 
  AND token = 'QvnT8NzOn2ePpyohAfY4/VcTsTSuHv4W6nDa7SJQO5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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