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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2baaeca2f7999cfa19adfafd06ce34646f240e5e9f03c83a185144e985544cf' 
  AND token = 'R2dYjv11SA211FfTEmTP8yYlbyiWtMHhVPG+gBmeE3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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