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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676dfa11c5e042a0b5f0499e1aaef0b24ef790d480116286ab0a36c3192ff9a2' 
  AND token = 'VNAsvrNYEsJN35nupXvp92QmoY7dM7CcBC4oPsFK+Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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