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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f2fcad45fa8163cd16f10abc0f0588dc962c8fcb1d8ead75308e91d3de8bac' 
  AND token = 'MuU9ef04zgamjQMAcTwll/Q8cn+CJU46xAy4KH2Rw5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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