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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2866760c5f4ed21d17874edf113cd5c29278d08c11c66aa11c74c3828804c59' 
  AND token = 'EFxMwUuGimqjCUbuQHI+zm2F+DqzmlDf96GoOrHED4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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