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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c4c1199bbbe86a9c147460284512efcdde11dd0c78bc213ba30adf6b68ffd8' 
  AND token = 'F3iBhwEa/xAFXvGhyitCQxPuCcNUWsyu3vLVOs8x4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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