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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fad4f6383f0656deb30f25a207ad870ec9b410c9453451a4b6945316d74e54' 
  AND token = 'U3uxbG3n/llAFaqusyFUCa4Hy4jwWijTZ8W1dJiVPno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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