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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c270a519f045e4b2b4b9392aa8ea7acdd1787eb84cde3db2087dd9942c731aab' 
  AND token = '0ai/lA94P9fXtNPPE9loV4faaUbzs2zlu+D1i3W0g7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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