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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48385273fd9450f225c109272fe495aa6683109e8135078248fc8c1efbcd50f' 
  AND token = 'bWU1Rms6FD70ZZX5puXU3Eu/IvZc22BEW4/nqS19/7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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