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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a273d521f67f5cd93a61ded86222e5cd2e355f2b6598d27c52887400b4ef9cb9' 
  AND token = 'MnsjtThHO6hcWXWiRNITAB1xW7ybspam2a7ZmpMoiKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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